Attendize Event Ticketing - Attendize is a free & open-source ticket selling and event management platform
Bumble - Bumble is a social network that allows you to feel empowered while you make those connections, whether you’re dating, looking for friends, or growing your professional network. One first move on Bumble could change your life.
Zoho Backstage - Plan, run, and analyze your event— all from one place
Tinder - Tinder is how people meet. It's like real life, but better.
Meetup for iOS and Android - Discover groups that are all about the things you love
Heaps - Tinder with your friends. Party in a group.